Good morning.
When the belt wears and gets slack in it, the teeth can become damaged and the belt will not turn.
Start with a compression test to verify. Remove the plugs and use a compression gauge. You can rent one at a parts store.
If it is the belt, it is an interference motor which means if the timing is out, valve damage will result. That means the head will have to be removed and the valves replaced. The pistons will also need to be inspected for damage.
Roy
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Monday, March 5th, 2018 AT 5:58 AM